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<head>
    <meta charset="UTF-8">
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          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
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    <title>constructor的使用</title>
</head>
<body>
<script>
    let ck = function () {}
    // 返回的是ck的爸爸的构造函数
    console.dir(ck.__proto__.__proto__ === Object.prototype) //true
    // ck的爸爸的构造函数 是本身
    console.dir(ck.prototype.constructor === ck)
</script>
</body>
</html>
